Guard for sewing-machine loop takers



Sept. 17, 1929. w. N. PARKES GUARD FOR SEWING MACHINE LOOP TAKERS FildAug. 11. l1927 INVENTOR Wzl/zam MPareJ BKZ (AA ORNY wmmss y. 73m

Patented Sept, 17, 1929 lunirse STATES PATENT OFFICE WILLIAM NnLsoNimaxes, on BROOKLYN, NEW YORK, Assre-Non To THE SINGER MANUFACTURINGCOMPANY, kOI" ELIZABETH, NEW JERSEY, ACOBCLORATION OF NEW JERSEY` GUARDFOR SEWING-MACHINE LOOP. TAKERS Application led Augustr 11; 192i?.Serial No.k 212,173.

This invention relates to improvements in sewing machines of the typeemploying a loop-taker to cas-t needle-thread loops around a mass ofunder-thread in the formation of lock-stitches.`

During the operation of a threaded sewing machine of this'rtype in theabsence of work, commonly termed chaining off,77 the chain of threadthus formed is liable to sag into the path of movement of the looptakerbeak and is therefore likely to become jammed in the loop-taker racewaylfor the bobbin-carrier.

The present invention has for its primary object to provide means forpreventing the thread-chain from being fouled by the looptaker. Afurther object of this invention is to provide improved means externalto the loop-taker for insuring a rapid spreading of the needle-threadloop toward the throat of the loop-taker beak or loop-seizing hook atthe beginning of the movement of said beak to cast the needle-threadloopabout a mass of under-thread.

The present improvement has been embodied in a sewing machine having alooptaker of the vertical-axis type, in which the loop-taker beak has ahorizontal path of m0- tion directly beneath the cloth-plate of themachine. .ln its preferred embodiment, the improvement comprises ahorizontally disposed, segmental guard-finger overlying that portion ofthe loop-taker beak path first traversed after seizure of theneedle-thread loop by said beak. The guard-finger is adjustably securedupon the machine frame below the cloth-plate and its shank portion isprovided with a needle clearance notch, one wall of said notchconstituting a stationary abutment for hastening the eXpansion of theloop by detaining the junction of its limbs while the loop is beingldistended by the loop-taker beak.

In the accompanying drawings, Fig. l is a substantially central,longitudinal section, partly in elevation, of a portion of a sewingmachine cloth-plate and its attached looptaker mechanism bracket andshowing the usual reciprocatory needle at substantially the lower end ofits stroke. Fig. 2 is a top plan kview; of the same portion of theclothplate, buty omitting the throat-plate, slide" plates and thefeed-dog. Fig. `3 is a detail .perspective view ofthe guard-finger.Certain featuresI of this loop-taker'mechanism are shown more in detailin myv application Serial No. herewith.y

' Referring to the drawings, the present 1 improvement is shown asembodied in a sewing machine having the usual bed orclothplate l, thethroat-plateQ and tliefslideplates 3 and 4 at thelopposite'sides of thethroat-plate. openings in the throat-plate `are the feeddog 5 and thereciprocatory needle 6.

' Suitably secured'to the underside of the bed-plate l is the loop-takerbijacket 7 sus- 212,172 filedy simultaneously Operating throughsuitable.

tainingthe loop-taker mechanism in its asl' sembled form as a detachableunit.r Journaled in said bracket 7 is the forward end of the rloop-takeractuating shaft 8, which rotates once yfor each complete reciprocation.of the'needle. l The actuating mechanism for the needle and the shaft 8may compriseany usual, properly timed construction. such as isillustrated, for instance, in the United States patent to J.C.-Ringe,No. 1,484,191,

.fda-ted Feb. 19, 1924. Also journaled in the bracket. 7 is thevertically disposed looptaker shaft 9y geared to the shaft 8 to derivetwo rotations for each rotation of said shaft 8. Secured upon the upperend of the shaft 9 is a horizontally rotating looptaker 10 having aloop-seizing beak 1l. It ywill be observed from Fig. l of the drawingsthat the point of the beak 1l is located at they upper rim of the`loop-taker body and that it isdirectly below the throate0 provi( ed asegmental guard-linger lil, ont of Contact with but directly overlyingthat portion of the loop-taker beak path first traversed after seizureof the needle-thread loop by said beak. The guard-nger eX- tendslaterally from its shank 15, adjustably secured upon a portion or" thebedplate 1 below the slide-plate 3, the securing means comprising ascrew 16 passing through an elongated slot 17 ior ned in said shaft 15.

At the point of juncture of the guardnger 11i with its shank 15, thelatter is formed with a notch 18 to provide clearance for the needle 6,the rearward wall 19 of said notch constituting an abutment for the loopof needle-thread seized by the looptaker. As the lower surface of theguard- 'inger is barely out 'of Contact with the looptaker rbeak and asthe abutment wall 19 is opposed to the direction of movement of saidloop-taker beak when seizing a loop of needle-thread, it is apparentthat said wall 19 functions to cause the needle-thread loop to slidealong the loop-taker beak yand to be rapidly spread by the inclined edge20 of said beak. The projection 21 forming the forward wall of the notch18 is part-ly cut away and' is beveled upwardly to guide theneedle-thread loop as it is drawn up after being cast aboutY thebobbin-carrier.

ll-laving thus set forth the nature of this invention, what I claimherein is:

1. ln a sewing machine, a cloth-plate, a reciprocatory needle, avertical-axis looptaker below said cloth-plate having a loopseizing beaktraversing a horizontal path to cast needle-thread loops about alowerthreadV mass, and a stationary guard-member disposed between theloop-taker and the cloth-plate overlying that portion of the loop-takerbeakl path first traversed by said beak after-engagement of theneedle-thread loop Ito thereby prevent sagging of the thread-chainintosaid loop-taker beak path.

2. ln a sewing machine, a cloth-plate, a reciprocatory needle. avertical-axis looptaker below said cloth-plate having a loopseizing beaktraversing a horizontal path to cast needle-thread loops about alowerthread mass, anda lined segmental guard finger lisposed between theloop-taker and the cloth-plate, said guard-finger overlying aA portionot the loop-taker bea-k path to prevent sagging of the thread-chain intosaid path.

3. In a sewing machine, a cloth-plate, a reciprocatory needle, avertical-axis loop-taker below saidcloth-plate having a loop-seizingbeak traversing a horizontal path of movenient to cast needle-threadloops about a lower-thread mass, and a iXed segmental guard-fingerdisposed between the looptaker and the cloth-plate to overlie a portionof the loop-taker beak path, said guardiinger being provided with aneedle-thread loop abutment wall directly rearward of the needle.

al. ln a sewing machine, a cloth-plate, a reciproeatory needle, avertical axis looptaker below said cloth-plate having a loopseizing beaktraversing a horizontal path of movement to cast needle-thread loopsabout a lower-thread mass, and a iXed segmental guard-finger disposedbetween the loop-taker and the cloth-plate to overlie a portion of theloop-taker beak path, said guard-iinger being provided with aneedleclearance notch, the rearward wall oi' said notch constituting aneedle-thread loop abutment, and the portion of the guard-iinin frontofthe notch being beveled upwa illy toward the Cloth-plate to guide thedisiiarged needle-thread loop.

in testimony whereoil l have signed my naine to this specification.

VILLLXM NELSON PARKES.

